Vacuum cleaner



Patente tl Mar. 28, 1939 UNITED' STATES PATENT oFrcE y 'VACUUM emm IErnst Feher Stuttgart, Germany Application November 17, 1937, Serial No.175.121

` In Germany-November 25, 1936 claim. (Ci. isa-35) gauze or wire nettingloosely arranged in the This `invention relates to avacuum cleaner .withan outer casing, a. motor fan unit arranged therein, an indiarubberring, arranged in the outer casing in front of the motor fan unit,against' which ring the motor fan unit bears, and a removable' cap,which closes the outer casing at its rear end.

The object of the present invention is to improve this known structurein such a way as to provide a particularly simple method of supporti ingthe motor fan unit, so as to enable this unit to be quickly andconveniently put in or taken out.

- Accordingly the removable cap that closes the outer casing at the rearend is of such concave shape that it directly forms an abutment for therear end of the motor fan unit.

The removal of the rear closure, cap'of the casing enables themotor fanto be readily put' suction aperture c, and at the rear .end with a'removable cap comprising elements d, m, r, n,

and an air discharge aperture e. In the casing is yieldingly arrangedthe motor fan unit f, which bears loosely at its front end against anindiarubber ring g mounted in the vacuum cleaner casing. In front' ofthe motor fan unit a dust bag his provided in the outer casing of thevacuum cleaner. The part d of the rear closure cap is` made ofinsulating material, an artificial resin for example, and is secured ina readily detachable manner by means of a number of screws i arranged onitsperiphery to a metal ring k, which 'in itsjturn is arranged'upon thebody a "of the casing. At its free end the part d carries a sheet metalinsertion m, which is dished insuch'a way as to format the same time therear abutment n for the motor fan unit, a cavity o for the accommodationof a supplementaryfllter p, q, p' removable at the rear, and a tubularelement r for mounting a cover s provided with' a discharge v aperturee. The abutment n has a central aperture w for accommodating the rearend t of the motor i'anunit, and is also provided with apertures u. forthe passage of air; The arrowsindicate the direction oi' flow of theair. 'The supplementar'y filter consists of a thickglayer 'q ot 5filtering material, made of wadding tor instance,

and suitably saturated with a disintectant, a per- !ume or the like. ando! two sheets p, p' of wire 4 rial q can be replaced by a fresh one.

c'avity o to hold and stiflen the layer of filtering material. One ofthese stifiening layers. through which air can pass, bears against thebottom of the cavity o, and the other is held in contact with thefiltering material q by abutment bolts v projecting forwards from thecover s.

i For thepurpose of exchanging the Supplementary filter all that isnecessary is to remove the covers from the tubular mounting connectionr, upon which it may be secured by friction or otherwise, the outerstrainer or sieve p also being removed, whereupon the layer of filteringmate- On the other hand the unscrewing of the part d !rom thering Icenables the motor fan unit to be released quickly and taken out.

The cap d, m, r, n, may be made entirely of sheet metal. The front sieveplate p may be replaced'by a ring hearing on the outer mai-gin of thelayer of filtering material, or may be entireiy omitted. In the lattercase the frustoconical portion n is preferably so shaped as to form atthe mai-gin an annular flange supporting the layer of filteringmaterial. The simple marginal supporting of the'actual filtering layeris suflicient, having regard to the pressure exerted. by the air uponthe filtering layer when the vacuum cleaner is in operation to press thefiltering layer against the rear supporting sieve p'. This 'last-namedsieve or periorated plate may be fixedly mounted on the supporting boltsv and may then be taken' ofi' or put on along with the cover s. Animportant feature isthe sub-dividing 'of the filter into the filteringlayer, removable by itself, and capable of being cheaply manufactured.

preferably of wadding or some similar pliable -material, and asupporting sieve or perforated plate or the like 'pressed by means oi*`the mounting cover against this filtering layer. The wadding enables the.filter to absorb a large amount of disinfectant or the like, thusgiving Satisfactory and eiiective filtering over a long period. besidesconsiderably improving the clamping of noise.

WhatIclaim is: i

A v'acuum cleaner, comprisng an outer casing. a motor fan unit enclosedin the outer casing, an indiarubber ring lodg ed in the outer casing infront of the motor fan unit, the motor tan unit hearing against theindiarubber ring, and a detachable cap ciosing the casing at the rearend, the detachable cap being or such concave shape as to Iorm'directlyan abutment hearing against

